Globe-holder.



.Patentedv Oct. I6, |900. H. C. SPINNEY.

GLOBE HoLnEn (Appliction led Mar. 28, 1899.)

(No Model.)

lnv ehi; or.

es. n .m D) s @M w n e H UQ b Jqihg.

No.. wnsnmmow u c Unirse ATENT OFFICE.

HENRY C. SPINNEY, OF LYNN, MASSACHUSETTS, ASSIGNOR TO 'THE GENERAL ELECTRIC COMPANY, OF NEW YORK.

GLOBE-HOLDER.

SPECIFICATION forming part of Letters Patent No. 659,706, dated October 16, 1900.

Application led March 23, 1899 .n Serial-No. 710,172. (No model.)

To @ZZ whom, it 11m/y concern:

Be it known that I, HENRY O. SPINNEY, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Globe-Holders, (Case No. l,156,) of which the following is a specification.

My invention relates more particularly to the holders for globes of arc-lamps, and has for its object to improve their construction.

In the accompanying drawings, which illustrate au embodiment of my invention, Figure l is a sectional view of a globe and holder with a portion of the lamp-frame. Fig. 2 is an elevation of a modified form of the globeretaining device, and Fig. 3 is a plan view of the same.

At the present time it is customary to clean the arc-surrounding globes or cylinders of the various arc-lamps on a system at the central station and also to insert new cai-bons in the holders at that time, thus simplifying the work of the trimmer to a material degree.v

W'hen this is done, the cylinders are placed in a suitable rack or holder in readiness for the trimmer, and as he trims a lamp a clean cylinder is removed and a dirty one substituted.

lWIy invention is directed principally toward providing a suitable holder for the cylinder and carbon which is removable; but the invention is not restricted to this, since certain of the parts may be arranged to form a permanent part of the lamp.

Referring to the drawings, A represents the side tubes or supports of an arc-lamp, and connecting the tubes is a yoke B, having a socket C for receiving the combined carbon and globe holder D. The holder D is provided with a tubular receptacle in which the carbon E is inserted, a plug E for closing the end of the receptacle, and a set-screw G for clamping the carbon in place. The holder is arranged to be inserted in the socket C and is retained in place by a set-screw II. (Shown in dotted lines.) The upper portion of the holder is flared upwardly to form a seat D', with which the nut I engages when the globeholder is mounted in its proper position. For

the purpose of illustration the clamping device for the inner globe or cylinder is shown in the process of being assembled or mounted in place. The upper portion of the holderD has a bore somewhat larger than the diameter of the carbon E and is screw-threaded to receive the globe-retaining device J. In the present instance the globe-retaining device consists of a thin metal sleeve which is screwthreaded on the lower end and is4 provided with an outwardly-Haring flange J that engages with the inner surface of the cylinder K when the parts are assembled in their proper position. The outwardly-flaring flange J may be slotted, aS ah, Figs. 2 and 3, in order to provide a certain amount of spring in the retaining device to compensate for irregularities in the material of which the cylinder K is composed and for the changes in the.

cylinder due to expansion and contraction caused by the heat from the arc; but I prefer the solid construction shown in Fig. l. Situated between the cylinder K and the nut I is a washer or packing-ring L. This ring is designed to form a seat for the cylinder and prevent the entrance of air at this point when the nut has been adjusted to its normal position.

In holders for inner globes of arc-lamps it is very essential that the holder shall press evenly and firmly against the material of which the cylinder is composed, particularly if the latter is made of glass. I have found that if the holder is so designed that it presses more at one point than at another the cylinder is liable to crack at the point of greater pressure.

In assembling the cylinder and its holder the tubular piece J is inserted in the cylinder from the upper end. The nut I is then mounted in place and screwed upward until the outwardly-flaring flange of the sleeve J rests firmly and evenly on the inner surface of the cylinder. This firmly secures the cylinder K in place, after which the carbon may be inserted and the sleeve J mounted in place by screwing it into the holder D.

With the parts arranged as shown the trimmer may leave the holder D in the lamp and merely remove the cylinder, sleeve J,

and nut I; or he may remove both the globe and carbon holders. In certain instances this will be a considerable advantage, par- IOO i enables a trimmer to perform his duties in a ver)T short time.

Having thus described my invention, what I claim as new,and desire to secu re by Letters Patent of the United States, is-

l. In an electric-arc lamp, the combination of a yoke having an opening for receiving the globe-holder, a support for the yoke, and a globe-holding device which holds the globe independent of the yoke and comprises a clamp mounted in the socket and arrangedV to engage with the inner surface of the globe, a packing-ring, a nut for drawing the clamp into engagement- With the globe so that'the latter will rest on the packing-ring,and means independent of the globe-clamping nut for securing the clamp in the yoke.

2. In an arc-lamp, the combination of a yoke having a socket, a combined carbon and globe holder mounted in the socket, means for retaining the holder in place, separate means for retaining the carbon in place, and adjustable means for clamping the globe in place.

3. In an electric-arc lamp, the combination of side rods, a yoke connecting the side rods ,threaded globeholder mounted in the opening, the globe-holder consisting of a tubular sleeve having an outwardly-flaring end which engages with the inner Wall of the globe, means for forcing the end of the sleeve into engagement with the globe, and other means for securing the holder in the socket.

In witness whereof I have hereunto set my hand this 20th day of March, 1899. l

HENRY C. SPINNEY.

Witnesses:

DUGALD McKILLoP, HENRY O. WESTENDARP. 

